| /* Test if a memory region is wholly unwritable. Mach version. |
| Copyright (C) 2004-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <stdlib.h> |
| #include <stdint.h> |
| #include <mach.h> |
| |
| /* Return 1 if the whole area PTR .. PTR+SIZE is not writable. |
| Return -1 if it is writable. */ |
| |
| int |
| __readonly_area (const char *ptr, size_t size) |
| { |
| vm_address_t region_address = (uintptr_t) ptr; |
| vm_size_t region_length = size; |
| vm_prot_t protection; |
| vm_prot_t max_protection; |
| vm_inherit_t inheritance; |
| boolean_t is_shared; |
| mach_port_t object_name; |
| vm_offset_t offset; |
| |
| while (__vm_region (__mach_task_self (), |
| ®ion_address, ®ion_length, |
| &protection, &max_protection, &inheritance, &is_shared, |
| &object_name, &offset) == KERN_SUCCESS |
| && region_address <= (uintptr_t) ptr) |
| { |
| region_address += region_length; |
| if (region_address < (uintptr_t) ptr) |
| continue; |
| |
| if (protection & VM_PROT_WRITE) |
| return -1; |
| |
| if (region_address - (uintptr_t) ptr >= size) |
| break; |
| } |
| |
| return 1; |
| } |